No fish, no eyelids. This kind of animal lives in water. It can keep the eyes moist without eyelids, and it doesn't need eyelids to protect the eyes. However, sharks have blink membranes or instantaneous folds similar to eyelids, which can protect their eyes when they prey. The vision of fish is not developed. They can see the nearby objects clearly, but they can perceive the position of surrounding fish through the side line, which is convenient for them to prey. 1、 Do fish have eyelids? Fish have no eyelids. For fish, it can keep their eyes moist without eyelids. At the same time, they will not encounter some dust and other conditions in the water, which will lead to their eyes dazzled, so eyelids have no effect. However, sharks have blink membranes or instantaneous folds similar to eyelids, which can cover their eyes when launching an attack, so as to avoid eye injury. 2、 What are the feelings of fish 1. Vision: the vision of fish is not developed. It can only see nearby objects, and can't see things too far away. However, with the help of the refraction of water, they can still see the situation on the water surface, so they can avoid predators. Unlike terrestrial animals, fish predation does not rely on vision, but perceives the trend of food through lateral lines.
2. Smell: the smell of terrestrial animals is mainly to feel the volatile gases in the air, but fish live in water, so its smell is different. There are two holes in the snout of fish, which have olfactory sacs. When the water flows through, it can feel the amino acids in the water body, so as to judge the water quality and know the types of surrounding fish.
3. Taste: fish also have taste. Its taste buds are not only in the mouth, but also on its lips and head. When a fish eats something it is not familiar with, it will repeatedly swallow and spit out to judge whether it is edible.
4. Hearing: Although you can't see the fish's ears, fish actually have hearing. Its inner ear is hidden in the head, and its auditory range is relatively narrow. More often, it feels the water flow to judge whether there is danger around, but the ear also plays a role in maintaining balance. （YuYouYanPiMa，YuLeiDeGanJiaoYouNaXie）